package com.guigutool.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.guigutool.reggie.common.BaseContext;
import com.guigutool.reggie.common.R;
import com.guigutool.reggie.constant.SystemConstant;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author: KingWang
 * @Date: 2023/3/8
 * @Desc:
 **/
@Component
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter extends HttpFilter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

//    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        HttpServletRequest request = (HttpServletRequest) servletRequest;
//        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        log.info("拦截到请求:{}", request.getRequestURI());
//        filterChain.doFilter(request,response);
//    }

    @Override
    protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {

        log.info("拦截到请求:{}", request.getRequestURI());
        //1. 获取本次请求的URI
        String requestURI = request.getRequestURI();

        //2.定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login", //移动端登录
                "/doc.html",  //生成swagger api文件，这里不放行，在登录后，也可以查看
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2. 判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3. 如果不需要处理，则直接放行
        if(check){
            chain.doFilter(request,response);
            return;
        }
        //4-1. 判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute(SystemConstant.SESSION_USER_ID) != null){
            Long employeeId = (Long)request.getSession().getAttribute(SystemConstant.SESSION_USER_ID);
            BaseContext.setCurrentId(employeeId);
            long id = Thread.currentThread().getId();
            log.info("线程id为：{}", id);

            chain.doFilter(request,response);
            return;
        }

        //4-2 . 判断登录状态，如果已登录，则直接放行 移动端登录
        if(request.getSession().getAttribute(SystemConstant.MOBILE_USER_ID) != null){
            Long userId = (Long)request.getSession().getAttribute(SystemConstant.MOBILE_USER_ID);
            BaseContext.setCurrentId(userId);
            long id = Thread.currentThread().getId();
            log.info("线程id为：{}", id);

            chain.doFilter(request,response);
            return;
        }

        //5. 如果未登录，则返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls, String requestURI){
        for(String url:urls){
            if(PATH_MATCHER.match(url, requestURI)) return true;
        }
        return false;
    }

}
